Physically-based behavior of parts and subassemblies provides the user with realistic virtual assembly planning environment. Parts’ mating is an important phase of the assembly operation. It determines the feasibility of the operation and affects the assembly sequence generated from the interaction with virtual parts. Haptic sensation of forces generated by the contacts between parts, during the mating phase, is a perception cue which assists the operator in locating the parts in their final assembly positions and orientations [1]. The research work reported in this paper focuses on modeling the dynamic behavior of mechanical parts during the execution of virtual assembly operation. The concept of spring-damper model was adopted to preclude the interpenetration of parts during the mating phase. The concept of “visual dynamic behavior” representing the manipulation of real parts was developed. More investigations are required to extend this concept to include the manipulation of subassemblies.
Actually, virtual reality is introduced in so many areas, such as medicine, automotive industry, robotics, entertainment, etc. A common interest of these areas is related with the user interaction, or with devices allowing users to interact with virtual reality. In this work we present the development of a prototype to capture the user’s fingers motion, obtaining the flexion angles of the fingers and representing them in a virtual assembly environment. The developed prototype is composed by a mechanical system which transmits the generated flexion movements of the medial and proximal phalanges. The movement is transmitted using a nylon cable, which is captured by the use of a webcam. The offset of the cable is measured, and this permits to obtain the angular variation of the generated flexion by the phalanges. The Lucas-Kanade algorithm is used to follow, in a high velocity, the cable displacement. Experimental results showed that angular resolution is very high and angular capture-rate is over 30fps. We present an implementation of our prototype in a virtual assembly environment.
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